Motorcycle



FIG. 1 is a front elevation view of a motorcycle showing our new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is an elevation view of the left side thereof;

FIG. 4 is an elevation view of the right side thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a perspective view thereof.

The broken line showing of the engine is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a motorcycle, as shown and described. 